The intraembryonic coelom
(or somatic coelom
) is a a portion of the conceptus
forming in the mesoderm
. During the second week of development, the lateral mesoderm splits into a dorsal somatic mesoderm (somatopleure
) and a ventral splanchnic mesoderm (splanchnopleure
). The resulting cavity between the somatopleure
is called the intraembryonic coelom
. This space will give rise to the thoracic and abdominal cavities.
It briefly has a connection with the extraembryonic coelom.